US7345857B2 - Power supply with surge voltage control functions - Google Patents
Power supply with surge voltage control functions Download PDFInfo
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- US7345857B2 US7345857B2 US10/768,052 US76805204A US7345857B2 US 7345857 B2 US7345857 B2 US 7345857B2 US 76805204 A US76805204 A US 76805204A US 7345857 B2 US7345857 B2 US 7345857B2
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- voltage
- power source
- rectifier
- power supply
- current path
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
- H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Definitions
- the present invention relates to a power supply, and more particularly to a power supply with surge voltage control functions minimizing a power supply loss.
- AC power sources provide a voltage of 110V or 220V. Korea and Europe uses AC power sources supplying a voltage of 220V, whereas United States of America and Japan use AC power sources supplying a voltage of 110V. Accordingly, a power supply built into electronic devices is generally provided with a voltage selection switch to select 110V or 220V as an input voltage thereto.
- FIG. 1 shows a detailed circuit of a conventional power supply.
- the power supply shown in FIG. 1 has a fuse 10 connected in series to an AC input terminal AC 1 , an LC filter 20 connected to the fuse 10 and another AC input terminal AC 2 , and a rectifier 30 to rectify an output voltage of the LC filter 20 .
- the fuse 10 is electrically open-circuited when an AC input source supplies a voltage over a certain potential level, to thereby protect the power supply.
- the power supply usually has voltage characteristics to withstand 250V in countries supplying 220V through the AC power source, and also has diverse current capacities depending upon electronic devices in which it is built.
- the LC filter 20 eliminates noise included in the AC power source.
- the frequency of the AC power source ranges from 50 Hz to 60 Hz, and the LC filter 20 eliminates frequencies lower or higher than this frequency range.
- the rectifier 30 rectifies and converts into a dc voltage a voltage of the AC power source filtered through the LC filter 20 .
- the rectifier 30 full-wave-rectifies, through a bridge diode 31 , a voltage of the AC power source that is temperature-compensated by a thermistor 33 , smoothes the rectified voltage through a capacitor 32 , and converts the smoothed voltage into a complete dc voltage.
- an electrolytic capacitor having excellent low-frequency characteristics is usually used for the capacitor 32 .
- the thermistor 33 is an element that lowers its resistance value as an ambient temperature rises, which limits an electric current that is applied to the bridge diode 31 before the power supply reaches a steady state. If the power supply reaches the steady state, the power supply usually radiates a certain amount of heat, and the resistance value of the thermistor 33 is set to have an optimum value when the power supply has a predetermined temperature in the steady state. Accordingly, before the power supply reaches the steady state, excessive current is prevented from flowing into the bridge diode 31 .
- the electrolytic capacitor 32 is a capacitor formed with a metal film and a dielectric layer inserted in electrolyte, and explodes if a voltage outputted from the rectifier 30 exceeds the voltage that the power supply can withstand, and, when exploded, the electrolyte splashes over the circuit components constituting the power supply.
- the electrolyte Since the electrolyte is electrically conductive, the splashed electrolyte short-circuits neighboring circuit components, thereby breaking down the power supply. Further, a dc voltage smoothed through the electrolytic capacitor 32 applies stress on the power supply just before the electrolytic capacitor 32 explodes, which deteriorates electric characteristics of the circuit components constituting the power supply.
- FIG. 2 is a circuit diagram showing a power supply protection device formed at an input stage of another conventional power supply.
- the power supply protection device shown in FIG. 2 has a varistor 50 connected to the AC input terminals AC 1 and AC 2 , a fuse 40 connected in series to the AC input terminal AC 1 , an LC filter 60 connected in series and in parallel with the fuse 40 and the AC input terminal AC 2 , respectively, to eliminate noise included in a voltage of the AC power source.
- the varistor 50 is an element that lowers its internal resistance value as a value of the voltage applied thereto increases, which forms a current path between the AC input terminals AC 1 and AC 2 when a potential difference therebetween increases so that an excessive voltage is not applied to the LC filter 60 .
- the varistor 50 consists of a ZnO 2 material of conductivity, and a surge current passes therethrough when a voltage applied thereto exceeds a predetermined voltage. At this time, if the surge current exceeds the limit capacity of the varistor 50 , the varistor 50 is broken down so that the power supply can not be protected, and fragments thereof are scattered, thereby impacting on its ambient components. Further, there is a problem in that the scattered fragments cause the electric parts of the power supply to be short-circuited so that additional damage is incurred by the parts.
- a power supply with surge voltage control functions comprising a rectifying unit to rectify a voltage of an AC power source externally applied; a fuse resistor to input and apply the AC power source to the rectifying unit and cut off the voltage of the AC power source exceeding a predetermined value; a pulse generation unit driven by an output voltage of the rectifying unit and to generate a pulse having a predetermined period; a transformer driven by the pulse and to induce a predetermined ac voltage; and a surge voltage control unit turning on by the ac voltage induced by the transformer to form a first current path between the AC power source and the rectifying unit, wherein a second current path is formed between the AC power source and the rectifying unit via the fuse resistor when the output voltage of the rectifying unit exceeds the predetermined value.
- the surge voltage control unit includes a voltage generator to generate a dc voltage from the ac voltage induced by the transformer; a first switch to form the first current path between the AC power source and the rectifying unit by the dc voltage received from the voltage generator 610 ; and a second switch to turn off the first switch when the output voltage of the rectifying unit exceeds the predetermined value and to form the second current path between the AC power source and the rectifying unit via the fuse resistor.
- the voltage generator includes windings formed at a secondary side of the transformer; a first diode having an anode connected to one end of one winding of the voltage generator windings; and a first resistor having one end connected to a cathode of the first diode and another end which forms a positive(+)voltage output terminal.
- the first switch includes a triac having an input terminal connected to the AC power source and an output terminal connected to another end of the one winding formed at the secondary side of the transformer, and a gate connected to the positive voltage output terminal; and a second resistor and a first capacitor each connected between the gate and the output terminal of the triac.
- the second switch includes a bipolar transistor having a collector connected to the gate of the triac, and an emitter connected to the output terminal of the triac; and a zener diode having an anode connected to a base of the bipolar transistor and a cathode connected to a voltage output terminal of the rectifying unit.
- the second resistor is a damping resistor to consume residual current between the output terminal and the gate of the triac in a state that the triac is turned off.
- the first capacitor delays time at which an output voltage of the voltage generator is applied to the gate of the triac.
- the power supply further comprises LC filters provided between the AC power source and the rectifying unit, to reduce noise included in the voltage of the AC power source.
- a power suppy comprising a rectifying unit to rectify an externally applied AC power source; a switching unit to apply the AC power source to the rectifying unit through a first electrical path until the AC power source exceeds a predetermined value, and then to cut off the AC power source to the rectifying unit; a pulse generation unit to generate a pulse having a predetermined period and being driven by an output voltage of the rectifying unit; a transformer driven by the generated pulse to induce a predetermined ac voltage; and a surge voltage control unit to form a second path for a current to flow from the AC power source to the rectifying unit when turned on by the induced predetermined ac voltage, the current flowing from the AC power source to the rectifying unit through the first electrical path when the output voltage of the rectifying unit exceeds the predetermined value.
- the surge voltage control unit includes a voltage generator to generate a dc voltage from the ac voltage induced by the transformer a first switch to form a current path between the AC power source and the rectification unit by the dc voltage; and a second switch to turn off the first switch when the output voltage of the rectification unit exceeds the predetermined value and to form the current path between the AC power source and the rectifying unit via the switching unit.
- the foregoing and/or other aspects of the present general inventive concept may also be achieved by providing a method of providing surge voltage protection to a power supply, the method including rectifying a voltage of an externally applied AC power source received through a first electrical path; cutting off the voltage of the AC power source if the voltage exceeds a predetermined value; generating a pulse of a predetermined period from the rectified voltage; inducing a predetermined ac voltage by the generated pulse; and switching the first electrical path to a second electrical path between the AC power source and the rectifying operation to provide current to the rectifying operation through the second electrical path when an output voltage of the rectifying operation exceeds a predetermined value, and returning the flow of the current from the AC power source to the rectifying operation through the first electrical path when the output voltage of the rectifying operation does not exceed a predetermined value.
- power supply comprising a power source generating an ac voltage; a rectifier connected to the power source to convert the ac voltage to the dc voltage; a first current path line connected between the power source and the rectifier; a second current path line connected between the power source and the rectifier; and a surge voltage controller selecting one of the first current path and the second current path line as a current path from the power source to the rectifier according to the dc voltage value.
- the first current path line comprises a switch turned on and off according to the dc voltage value.
- the second current path line comprises a switch causing a voltage drop between the power source and the rectifier.
- the power supply further comprises a transformer connected to the rectifier and the surge voltage controller to generate another ac voltage, wherein the surge voltage controller selects the first current path line according to the another ac voltage.
- an electrical apparatus preventing power surges comprising: a power supply to supply an ac voltage, the power supply including: a rectifier to convert the supplied ac voltage to a dc voltage, a first current path line connected between the power source and the rectifier, a second current path line connected between the power source and the rectifier, and a surge voltage controller selecting one of the first current path line and the second current path line as a current path from the power source to the rectifier according to the converted dc voltage value; and at least one electrical component to receive an output of the power supply.
- the first current path line comprises a switch turned on and off according to the dc voltage value.
- the second current path line comprises a switch causing a voltage drop between the power source and the rectifier.
- the power supply further comprises a transformer connected to the rectifier and the surge voltage controller to generate another ac voltage, wherein the surge voltage controller selects the first current path line according to the another ac voltage.
- FIG. 1 is a detailed circuit diagram showing a conventional power supply
- FIG. 2 is a detailed circuit diagram showing a power supply protection device formed at an input stage of a conventional power supply.
- FIG. 3 is a detailed circuit diagram showing a power supply according to an embodiment of the present invention.
- FIG. 4 is an electrical apparatus having a power supply suppling an ac voltage, according to another embodiment of the present invention.
- FIG. 3 is a detailed circuit diagram showing a power supply according to an embodiment of the present invention.
- the power supply shown in FIG. 3 has a noise filter 100 , a fuse resistor 200 , a rectifier 300 , a pulse generator 400 , a transformer 500 , and a surge voltage controller 600 .
- the noise filter 100 reduces noise induced in a voltage of an AC power source AC_IN.
- the voltage of the AC power source AC_IN has a frequency ranging from 50 Hz to 60 Hz, and the noise filter 100 eliminates frequencies lower or higher than this frequency range so as to reduce the noise induced in the voltage of the AC power source AC_IN.
- the fuse resistor 200 is a resistor that becomes electrically open-circuited when a voltage exceeding a predetermined voltage value is applied thereto, and the fuse resistor 200 does not cause additional damage to the power supply since the fuse resistor 200 does not splash or scatter electrolyte or conductive fragments over the noise filter 100 , the rectifier 300 , the pulse generator 400 , and/or the surge voltage controller 600 .
- the rectifier 300 rectifies a voltage of the AC power source AC_IN having noise reduced by the noise filter 100 and converts the rectified voltage into a dc voltage.
- the rectifier 300 includes a bridge diode 301 to rectify the voltage of the AC power source AC_IN and a capacitor 302 to smooth out the rectified voltage.
- the pulse generator 400 is driven by the dc voltage converted in the rectifier 300 , and generates a PWM (pulse width modulation) pulse having a frequency and a duty ratio based on predetermined values.
- the generated PWM pulse turns on and off the primary winding of the transformer 500 to induce predetermined ac voltages across secondary windings of the transformer 500 .
- the transformer 500 has one primary winding T 1 _ 2 and four secondary windings T 1 _ 1 , T 1 _ 3 , T 1 _ 4 , and T 1 _ 5 .
- the primary winding T 1 _ 2 is driven by the pulse generator 400 and induces a predetermined ac voltage across the secondary windings of the transformer 500 .
- the ac voltages induced across the secondary windings T 1 _ 1 , T 1 _ 3 , T 1 _ 4 , and T 1 _ 5 are determined based on a winding ratio with respect to the primary winding T 1 _ 2 .
- the surge voltage controller 600 is turned on by an the voltage induced across the secondary winding T 1 _ 3 to form a first current path between the AC power source AC_IN and the rectifier 300 via the surge voltage controller 600 , and, when an output voltage of the rectifier 300 exceeds a predetermined potential level, that is, when a surge voltage is applied, the surge voltage controller 600 changes the first current path to a second current path in which the voltage of the AC power source is applied to the rectifier 300 through the fuse resistor 200 , to thereby disconnect the AC power source AC_IN. and the rectifier 300 from their connection to each other via the surcharge voltage controller 600 . At this time, a voltage to open-circuit the fuse resistor 200 is made lower, by a certain amount of voltage, than the surge voltage.
- the noise filter 100 has a damping resistor 101 , a first LC filter 102 , a second LC filter 106 , a fuse 105 , and capacitors 103 and 104 .
- the damping resistor 101 consumes current remaining on power lines when the AC power source AC_IN is cut off. At this time, the damping resistor 101 forms a current path with capacitors 102 a and 102 b provided in the first LC filter 102 to consume residual current.
- the first and second LC filters 102 and 106 eliminate noise from the AC power source AC_IN having a frequency range of 50 Hz ⁇ 60 Hz, that is, frequencies lower or higher than the frequency range of the AC power source AC_IN.
- the fuse 105 prevents a voltage of the AC power source AC_IN from being applied to the inside of the power supply in the case where a potential level of the AC power source AC_IN through the first LC filter 102 is excessively high.
- the capacitors 103 and 104 are bypass capacitors, which discharge to a ground high-frequency noise introduced into the AC power source AC_IN.
- the rectifier 300 has a bridge diode 301 and a capacitor 302 .
- the bridge diode 301 rectifies a voltage of the AC power source noise-eliminated by the noise filter 100 .
- the capacitor 302 smoothes and converts a rectified ac voltage into a complete dc voltage.
- the pulse generator 400 has resistors 401 , 402 , and 405 , a PWM IC 403 , and a diode 406 .
- the resistors 401 and 402 limit current from the dc voltage outputted from the rectifier 300 , and then provide a driving voltage to the PWM IC 403 .
- the current provided to the PWM IC 403 passes through the two resistors 401 and 402 so that an electric power value for each of the resistors 401 and 402 is low. That is, one resistor may be used, but, in order to reduce stress applied to the resistor, the two resistors 401 and 402 are used here to reduce the current flow.
- the PWM IC 403 is driven by a dc voltage applied through the resistors 401 and 402 , and generates a PWM pulse having a predetermined frequency and duty ratio.
- the generated PWM pulse is applied to the gate of an NMOS 404 , and the NMOS 404 turns on and off the primary winding T 12 of the transformer 500 according to the PWM pulse to thereby induce predetermined ac voltages across the second windings, for example, T 1 _ 1 , T 1 _ 3 , T 1 _ 4 , and T 1 _ 5 , of the transformer 500 .
- the diode 406 forms a current path between a positive voltage and a negative voltage that are outputted from the rectifier 300 together with the secondary winding T 11 . At this time, since the diode 406 has a high resistance in the reverse direction, the potential level of the dc voltage applied to the PWM IC 403 is not changed.
- the surge voltage controller 600 has a voltage generator 610 , a first switch 620 , and a second switch 630 .
- the voltage generator 610 half-wave-rectifies an ac voltage induced across the secondary winding T 13 of the transformer 500 when the power supply operates to generate a predetermined dc voltage.
- the first switch 620 is turned on by the dc voltage supplied from the voltage generator 610 to form the first current path, where the voltage of the AC power source AC_IN is applied to a node A, such that the current is not applied to the fuse resistor 200 and does not flow through the second current path.
- the fuse resistor 200 provides a path, e.g., the second current path, for the voltage of the AC power source to be applied to the rectifier 300 only at the time the power supply is initially turned on, and, if the first switch 620 is driven, the voltage of the AC power source AC_IN is not supplied to the rectifier 300 via the fuse resistor 200 , and the second path is bypassed.
- the second switch 630 will turn off the first switch 620 when an output voltage of the rectifier 300 exceeds a predetermined value, to thereby lead the voltage of the AC power source AC_IN to the fuse resistor 200 so that the fuse resistor 200 becomes open-circuited.
- the voltage generator 610 may include components such as, for example, a diode 611 and a resistor 612 . However, other component combinations may be used as an alternative which will provide the desired operation of the voltage generator 610 .
- the diode 611 rectifies an ac voltage induced across the secondary winding T 1 _ 3 of the transformer 500 .
- the present invention as illustrated FIG. 3 presents the half-wave rectification by use of one diode 611 , but, in addition, can be implemented to provide a full-wave rectification.
- the resistor 612 restrains current due to a dc voltage rectified through the diode 611 .
- the first switch 620 has a capacitor 621 , a resistor 622 , and a triac 623 .
- other component combinations may be used as an alternative which will provide the desired operation of a switch as provided by switch 620 .
- the capacitor 621 is charged with the dc voltage applied through the resistor 612 so as to prevent the dc voltage applied through the resistor 612 from being abruptly applied to the triac 623 . Accordingly, a potential level of the dc voltage applied to a gate G of the triac 623 slowly increases to thereby prevent the triac 623 from being damaged.
- the resistor 622 consumes residual current between the gate G of the triac 623 and an output terminal T 2 when the ac voltage is not induced across the second winding T 13 of the transformer 500 , that is, when the power supply is turned off. At this time, the residual current is consumed via a current path formed with the resistor 622 , the diode 611 , and the resistor 612 .
- the triac 623 is turned on with the dc voltage applied to its gate G from the voltage generator 610 so that the first current path is formed between the node A and a node B. Accordingly, the voltage of the AC power source AC_IN outputted from the noise filter 100 is applied to the rectifier 300 through the triac 623 rather than through the fuse resistor 200 .
- the turn-on resistance of the triac 623 is close to 0 ⁇ , so that the second current path is not formed through the fuse resistor 200 having a predetermined resistance value of, for example, 10 ⁇ .
- the second switch 630 has a zener diode 631 and a bipolar transistor 632 .
- a cathode of the zener diode 631 is connected to an output terminal of the positive(+) voltage of the rectifier 300
- an anode of the zener diode 631 is connected to a base of the bipolar transistor 632 .
- the zener diode 631 has as a breakdown voltage value that is the same as a value of the voltage at the time the positive voltage outputted from the rectifier 300 is a surge voltage. For example, provided that an output voltage of 10V is a surge voltage state, it is an aspect that the breakdown voltage of the zener diode is 10V.
- the zener diode 631 develops the breakdown phenomenon so that the output voltage of the rectifier 300 is applied to the base of the bipolar transistor 632 . Therefore, the bipolar transistor 632 is turned on to form a current path together with the voltage generator 610 , and the positive voltage is not applied to the gate G of the triac 623 , so that the triac 623 is turned off. Accordingly, a voltage of the AC voltage source AC_IN being applied to the node A is applied to the node B through the fuse resistor 200 and through the second current path.
- the surge voltage state of the output voltage of the rectifier 300 indicates that a voltage of the AC power source AC_IN is in the surge voltage state, which causes the fuse resistor 200 to be open-circuited. Due to the open-circuit of the fuse resistor 200 , components constituting the rectifier 300 and the pulse generator 400 receive less stress from a voltage of the AC power source in the surge voltage state, so the components constituting the power supply are not damaged.
- FIG. 4 illustrates an electrical apparatus 700 according to another embodiment of the present invention.
- the electrical apparatus 700 includes a power supply 710 supplying an ac voltage according to the power supply illustrated in FIG. 3 .
- the electrical apparatus further includes electrical components 720 and 730 in which the power is supplied to from the power supply 710 . Since the power supply 710 is protected from a surge voltage, as described above with reference to FIG. 3 , the electrical components 720 and 730 of the electrical apparatus 700 can receive the power stably from the power supply 710 .
- the present invention does not cause the loss of parts constituting the power supply due to a voltage of the AC power source being in surge voltage state. Further, the present invention does not cause a problem of damaging neighboring parts due to explosion of parts such as capacitors or varistors as in the prior art, as well as facilitates instant surge voltage cut-off with the use of semiconductor devices such as the triac as a switching element.
Abstract
Description
Claims (22)
Applications Claiming Priority (2)
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KR1020030008342A KR20040072759A (en) | 2003-02-10 | 2003-02-10 | Power supply with controlling surge input voltage |
KR2003-8342 | 2003-02-10 |
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US20040156160A1 US20040156160A1 (en) | 2004-08-12 |
US7345857B2 true US7345857B2 (en) | 2008-03-18 |
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US10/768,052 Active 2025-03-18 US7345857B2 (en) | 2003-02-10 | 2004-02-02 | Power supply with surge voltage control functions |
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US (1) | US7345857B2 (en) |
KR (1) | KR20040072759A (en) |
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US20130094111A1 (en) * | 2008-04-22 | 2013-04-18 | Belkin International, Inc. | Electrical surge protector and method of providing the same |
US20110110121A1 (en) * | 2009-11-09 | 2011-05-12 | Innocom Technology (Shenzhen) Co., Ltd. | Power supply circuit |
US20130329473A1 (en) * | 2012-06-08 | 2013-12-12 | Hon Hai Precision Industry Co., Ltd. | Voltage rectifier |
Also Published As
Publication number | Publication date |
---|---|
CN100405729C (en) | 2008-07-23 |
KR20040072759A (en) | 2004-08-19 |
CN1571257A (en) | 2005-01-26 |
US20040156160A1 (en) | 2004-08-12 |
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